APA (7th ed.) Citation

Hurlbert, G., Johnson, T., & Zahl, J. (2007). On Universal Cycles for Multisets.

Chicago Style (17th ed.) Citation

Hurlbert, Glenn, Tobias Johnson, and Joshua Zahl. On Universal Cycles for Multisets. 2007.

MLA (9th ed.) Citation

Hurlbert, Glenn, et al. On Universal Cycles for Multisets. 2007.